Some Xbox 360 Disc Images contain xbox file systems with invalid TOC entries (Most recently Turning Point: Fall Of Liberty). This will cause OSx360 to lock up and eventually crash. You can view your OSx360.log, and if the last line describes a file, most likely an invalid TOC is the culprit. This issue has been resolved, but the bug fix is minor and may not affect all users. If you need an update, please email me to request the new release and I will post it. Until then, I will most likely wait until more features have been added to support a new build.